16-14 gauge heavy duty heat-shrink 3-way terminals. A heavy duty heat shrink jacket makes it very difficult to cut into these heat shrink terminals during the crimping process, a common problem with basic heat shrink terminals. If, in a rare instance, you do pierce the jacket, during the heat shrink process the jacket will heal itself and fill in the hole with sealant. This is the highest quality line of heat of heat shrink terminals available. Quickly and securely connect three wires with one terminal. Constructed of three heat-shrink ring terminals riveted together through the stud holes. For use in harsh environments, after crimping the terminal onto the wire, simply apply heat. Keeps moisture out while ensuring your wire does not pull out of the terminal. Requires one crimp plus heat.